M174313 Secondary Deck Belt for John Deere X330 X350 X354 X370 42-Inch
M174313 Secondary Deck Belt for John Deere X330 X350 X354 X370 42-Inch
Overview
This aftermarket M174313 secondary mower deck belt fits select John Deere X330, X350, X354, and X370 lawn tractors equipped with compatible 42-inch mower decks.
The supplier lists this polyester replacement belt at approximately 5/8 inch wide by 108.6 inches long.
On the compatible two-belt 42-inch mower-deck path, M174313 is used as the secondary spindle-drive belt. A separate primary belt transfers power from the PTO clutch to the mower deck.
Important: Match the original M174313 belt number, installed deck, belt position, dimensions, and pulley routing before ordering. Do not select this belt using the tractor model or 42-inch deck width alone.
Key Features
- Aftermarket secondary mower-deck drive belt
- Replacement Number: M174313
- Supplier Reference: BT505-VS
- Supplier-Listed Width: Approximately 5/8 inch
- Supplier-Listed Length: Approximately 108.6 inches
- Supplier Metric Length: 2759 mm
- Supplier-Listed Profile Height: 13.5 mm / approximately 0.53 inch
- Material: Polyester
- Color: Gray
- Quantity Included: One belt
- Used on select John Deere 42-inch mower-deck configurations
Replaces These Belt Numbers
- M174313
Supplier Reference Number
- BT505-VS
Search-Friendly Number Formats
- M174313
- 174313
- BT505-VS
- BT505VS
Belt Specifications
- Component: Secondary mower-deck drive belt
- Length: Approximately 108.6 inches
- Metric Length: 2759 mm
- Width: Approximately 5/8 inch
- Profile Height: 13.5 mm / approximately 0.53 inch
- Material: Polyester
- Color: Gray
- Quantity: One belt
Published belt measurements can vary depending on how the belt is positioned and measured. Use the original M174313 part number as the primary fitment check.
Compatible John Deere Models
The supplier lists this M174313 belt for select 42-inch mower-deck configurations on the following John Deere lawn tractors:
- John Deere X330
- John Deere X350
- John Deere X354
- John Deere X370
Fitment note: These are supplier-provided model examples. This belt fits only the mower-deck and belt-routing configurations using M174313.
Secondary Deck-Belt Position
The compatible 42-inch mower deck uses separate primary and secondary belts:
- The primary belt transfers power from the engine-mounted PTO clutch to the mower deck.
- The secondary belt routes through the mower-deck spindle and idler pulleys.
This M174313 listing is for the secondary spindle-drive belt only. It does not include the separate primary deck belt.
On the compatible two-belt path, the primary belt may be identified as M169485 or UC39236.
John Deere X330 Fitment Note
The M174313 belt is used on select John Deere X330 tractors equipped with a compatible dedicated 42-inch Mulch deck.
On that two-belt deck path:
- M169485 / UC39236: Primary clutch-to-deck belt
- M174313: Secondary spindle-drive belt
The standard 42A Accel Deep deck uses a different mower-belt path. Confirm the installed deck and original belt number before ordering.
John Deere X350 Fitment Note
The supplier lists M174313 for select John Deere X350 tractors with compatible 42-inch mower decks.
The X350 can be equipped with different mower-deck configurations. Match the original M174313 number and confirm that the required belt is the secondary spindle-drive belt.
John Deere X354 Fitment Note
The supplier lists M174313 for select John Deere X354 42-inch mower-deck applications.
Confirm the original belt number, installed deck type, belt count, idler layout, and pulley routing before ordering.
John Deere X370 Fitment Note
The supplier lists M174313 for select John Deere X370 tractors equipped with compatible 42-inch mower decks.
Do not order this belt from the X370 model name alone. Match the original M174313 number and two-belt deck configuration.
M174313 vs. M169485
M174313 and M169485 perform different jobs on the compatible two-belt mower deck:
- M169485 / UC39236: Primary belt between the PTO clutch and mower deck
- M174313: Secondary belt routing through the spindle-pulley system
The belts are not interchangeable. This listing includes one M174313 secondary belt only.
Common Symptoms of a Worn Secondary Deck Belt
- The primary deck belt moves but the mower blades do not turn correctly
- One or both blades turn slowly under cutting load
- The belt squeals when the PTO clutch engages
- The belt repeatedly jumps off a spindle or idler pulley
- Visible cracking, fraying, glazing, or burned belt surfaces
- Loose belt tension with the tension system engaged
- Uneven blade speed across the mower deck
- Reduced grass-discharge or mulching performance
- Burning-rubber smell near the mower deck
Installation Notes
- Park the tractor on a level surface and remove the ignition key.
- Disconnect the spark-plug leads before working near the mower deck.
- Photograph or sketch the original belt routing before removal.
- Identify the primary and secondary deck belts before disassembly.
- Inspect both spindle pulleys and all idler pulleys for bearing wear.
- Inspect the tension arm, tension spring, and belt guides.
- Confirm the flat and V-shaped belt surfaces contact the correct pulleys.
- Make sure the belt is seated completely inside each pulley groove.
- Rotate the mower-deck pulley system manually before starting the engine.
- Replace seized pulleys or damaged tension components before operating the new belt.
Quick Ship Fulfillment
This item may ship directly from one of our trusted U.S. distribution partners to help reduce transit time. Packaging, labeling, or warehouse origin may vary, but the part will match the replacement number, fitment notes, and supplier specifications shown in this listing.
Why Buy From PTO Direct USA
- Part-number-first listings to help reduce fitment mistakes
- Focused mower-deck and PTO replacement parts
- Clear primary and secondary belt-position notes
- Practical support when you need help checking compatibility
FAQ
What does the M174313 belt fit?
The supplier lists M174313 for select John Deere X330, X350, X354, and X370 tractors equipped with compatible 42-inch mower decks.
How long is the supplier-listed M174313 belt?
The supplier lists the belt at approximately 108.6 inches long.
How wide is the supplier-listed M174313 belt?
The supplier lists the belt at approximately 5/8 inch wide.
What material is the M174313 belt made from?
The supplier describes the replacement belt as being made from polyester.
How many belts are included?
This listing includes one M174313 belt.
Is M174313 a primary or secondary deck belt?
M174313 is used as the secondary spindle-drive belt on the compatible two-belt 42-inch mower-deck path.
Does this listing include the primary belt?
No. This listing includes one M174313 secondary belt only. The compatible primary belt may use the M169485 / UC39236 number path.
Does M174313 fit the John Deere X330?
It fits select X330 tractors equipped with the compatible two-belt 42-inch mower deck. Confirm the original M174313 number before ordering.
Does M174313 fit the John Deere X350?
The supplier lists select X350 42-inch mower-deck applications. Match the original belt number and confirm the secondary-belt position.
Does M174313 fit the John Deere X354?
The supplier lists select X354 tractors with compatible 42-inch mower decks. Confirm the original M174313 belt number.
Does M174313 fit the John Deere X370?
The supplier lists select X370 42-inch mower-deck configurations. Match the installed deck, belt position, and original part number.
Does M174313 fit every John Deere 42-inch deck?
No. John Deere produced multiple 42-inch deck and belt configurations. Match the original belt number, deck type, belt count, dimensions, and routing.
Is M174313 the same as M169485?
No. M169485 / UC39236 is the primary belt on the compatible two-belt deck. M174313 is the secondary spindle-drive belt.
Is this the tractor traction-drive belt?
No. This listing is for a mower-deck drive belt. The traction-drive belt that moves the tractor is a separate part.
Can I order this belt using only the tractor model?
No. Confirm the original M174313 number, installed mower deck, belt position, dimensions, and pulley routing before ordering.
Related John Deere Parts and Guides
- M169485 / UC39236 Primary Deck Belt
- AM140973 Mulching Blades
- AM136733 / AM137483 Spindle Assembly
- John Deere X330 Quick Reference
Need a different belt? Browse the full mower deck belts collection.